A shadow is appearing when I render a scene that includes a transparent PNG file as part of the composition. In this case, it's a mockup of a metal sign. The PNG file uses alpha channel transparency to isolate the graphics within the frame (when opened in Photoshop, for example). The PNG renders well in Rhino, but Enscape seems to identify the entire file frame, creating what appears to be a shadow behind the transparent area of the object that is not desired.
Shadow Appear When Rendering Transparent Objects
- Applied Visual Chris
- Thread is Unresolved
-
Rick Marx
Approved the thread. -
Rick Marx
Moved the thread from forum Showcase to forum Bug | Error Reports & License Problems. -
I have moved your thread to our Bug and Error Reports section.
Could you verify you are using our latest release version as found here.
If so, could you perhaps share the PNG file with us to further test this.
-
Hi Rick,
Thanks for replying. PNG file is attached. I'm on the latest version (using Enscape with Rhino 7.)
-
Thank you for sharing the .PNG file with me.
I was not able to reproduce this as seen in the attached image, could you perhaps tell me step by step how you applied the image to see if that helps in resolving this.
-
Hi Rick, Thanks for replying. I've brought in the PNG file using Rhino's "picture" command. I can see a slight outline of the file edges in this image attached. The material underneath (the split-face CMU wall) is defined as a Rhino material using another image applied to a polysurface.
-
I've just tried 2 other PNG files, both edited and saved using Photoshop, and they do the same thing. At least the behavior is consistent. This happens when the picture is close to the surface that's receiving the shadow; in this case only a couple of model inches away from the polysurface.
-
Thank you for following up.
I was able to reproduce this now in both our latest stable and preview version and have forwarded this to our developers.
Once I have any new information I will update you.
-
Our developers have taken a look, and this is a current limitation in our renderer.
There are plans to address this however, but I am unable to give you any timeframe.
A workaround for now would be to recreate the actual geometry instead of using a cutout rectangle.
-
I have also tried to create completely invisible obstacles (exported from Revit) as barriers where I do not want viewers to be able to pass.
But thes also throw shadows and it has been aestethically unpleasing.
Some way to exclude transparent/cutout material shapes from shadow casting would be much appreciated.
-
I have also tried to create completely invisible obstacles (exported from Revit) as barriers where I do not want viewers to be able to pass.
But thes also throw shadows and it has been aestethically unpleasing.
Some way to exclude transparent/cutout material shapes from shadow casting would be much appreciated.
I will forward your Feedback, of course, thank you.
-
I'm having the same issue... I'll be following any progress made on this issue.
-
I'd like to +100 this.
-
+1 Any progress on a fix for this issue?
-
Hello everyone. I am happy to share that this issue has been fixed internally, so it should be out in one of our next versions!
